VOGH Exclusive: URL Redirection Vulnerability Found In Facebook

VOGH Exclusive: URL Redirection Vulnerability Found In Facebook [The Vulnerability Still Active & Not Been Patched]
Facebook -the world's largest social networking site with registered users of more than one billion, is considered among one of the safest site of the cyber space. To maintain such reputation Facebook Inc has done all the required steps, that one could possibly take. Like other high profile and very popular websites, Facebook also stand as one of the hot target of almost every cyber criminals of the world. To get rid of this and make FB safe and secure, the company have introduced what it called 'Bug Bounty' offer; where you can submit vulnerabilities to FB and get rewarded. We have seen many security researchers and hackers across the globe has done this and get their award. But not every time, and today I will talk about that- few days ago a reader of VOGH, who also goes by the nick name of 'Dr41DeY' has figured out a URL redirection vulnerability in Facebook. One of the link in Facebook App which is apps.facebook.com is posing URL redirection vulnerability. The hacker has demonstrated how any one can use  the vulnerability  in order to manipulate millions of innocent Facebook users. Let see  

Before publishing this, one of our VOGH representative have talked with Facebook Security regarding this security vulnerability, but due to some reason FB might overlooked this issue. Finally after waiting for almost a week, we the Team VOGH decided to bring this in-front of our reader. Let briefly go through with the vulnerable link- 

https://apps.facebook.com/a.php?u=http://www.voiceofgreyhat.com&mac=AQLy7nyXi5NBt31j&__tn__=*B&eid=AQLpbizR7KEf3cyD0VTN7fNtv99fMZABDp2gdWhvL-MQocJIPy3w4hUG7_7hrmSMqDq7QLCI9k_0LbB95NEz_6GUDHGNgTDsGP_rX-VWRHxfg5a--VlnN1K9FdG3NAek8r2JPWENkb2Mu56EckbZCGXcPie27OnHxE-H7MBufQel0Pr-ZjpCWB6QF5xHeWsdKqyHzjK2woBGGrjk9Dlgnzcw3d9ZWPzrwbGpm6MSkpks3mqEphXnTP2Vd9UDQxIs68NnTaO35XIwKq5t3CSdb11iU_34gzjfLgvvDo_BYbgtrGe0Juc5CpRSwd5nImw9oPPvn6Za9rrxO_ivROtOGc2b2S3bYzNLWpbDwt3cFN2rJ3JElyIR0vjB4R859PpE9SrZx6AD3s_liikzPh30YLVb8XvPABk7r9MShk6OrVFPiAWZnEvPx49UzPDSF-nEl188rEPAi0KGJ4u1zb10hhzmHUCjH04SezDByUkyNituMb2lgiQz-Xlpgy_tkVYR-U7plDa38N9VzdAj_Bwefd7B85ykZCAy9ZQOt48Ql8KQeKfivk3sThZIkLwWPiju7R28Sw6bj09vS_Y28kFSqanGe9tYAPfKIe4zOzQt9-Q1CC_EwX3ypOlyQ2yXMiU3lwp7M9EriKHRFDsTgsuzzF-uvlpx3UrWh8M55-NX0ULjr4kxjAR5g_1wU-luUyn_Ot6Ly1_ZbBdahyb5uSmCDNvF5kMuIH8Gxvpql45dNffGzKau9oZGn6r1OmsG47JIGipznCVaZnWjXAakDnEMX6X8ZtI-M-db1olzbBpJdj5sZe-x2VM02S5XsXJWe_QLxFDOupjbz8I82HETHQ9PbzSIMsJboll4E3-f_JQFfdzwEguLa8SC_ImRahWBCwKNJeSlmRv91FqWpQaChe5-UyAoqcblvK4jPuRO3qC7o-qMTQ2jEJqqUW46koulOmgNJpMYXPgRxjNGcwjyTPS59Nr08zq6eCNd1aYLh2E4s5MYXBtVUTF8l0uhQ2wYSoR66xZsI2tK0DD1KiQHyTO1QieBwPtCN3eWgRzUTg3lM3ttkuwYKRPPLDvtUOPWmZhYUzUFcbfPM2kXdpqyGlrGx9-ErKGygYKATx2xzrTzktjgW4q0L5wfO3CSKAOCAoKfi_pfz-zIHSNE8ZAjZDtpbC_chgkvbHWJYYIs7pnE1riWJYORACjkkRr6nZoivC3z_g-8JBahghwy2C34kJYZJ6cBC8LKoB6KCTbj_F1tArQAzcSUij4vrJNUATzsdlO_ol6HwUQb8FjoWa38Bhtx81stxB328sgC9IGu1omPG0QeNJVhcJwh6HyEwtgycBLrlcdedaWbkwvnjv3F3BWuJIi763nBeYuAgNUaEUYHaXu_ZJzXW8fQ72nz_hddGT_GH50&sig=89099

Replace voiceofgreyhat.com with any of your favorite site, and the the said vulnerability will allow you to get redirected to that very website you want to from Facebook. This loophole is still active, and any one can test that with the above url, we thought the impact of this loophole is very serious, as any malicious attacker can misuse the trust-hod of Facebook's url in order to harm regular internet users, while redirecting them to any junk or malfunctional websites.

Disclaimer:- Earlier I told that the issue has already brought into the notice of Facebook Security, but they overlooked the whole issue, so being a responsible cyber media, we VOGH are disclosing this to people. If any one misuse this vulnerability, then Voiceofgreyhat will not at all be responsible for any kind of mishap.

Update:- May be doing more that what we call late repent, but finally the above disclosed vulnerability has been patched by Facebook security team. 


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